Transcript INTRODUCTION TO INFORMATION SYSTEMS TECHNOLOGY

INTERNET AND
WORLD WIDE WEB
TECHNOLOGIES
(Week 11, Thursday 3/22/2007)
BUS3500 - Abdou Illia, Spring 2007
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LEARNING GOALS
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Identify and describe the major Internet
applications.
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Define the World Wide Web and its
operation.
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Define intranets and extranets and
explain how companies use them.
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Test your Internet knowledge (1)
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This week we saw that a network can be set in order to
share software resources (like data files, databases, and
programs) and hardware resources (like printers). In
other words, we can say that a network can be set to
provide file service, database service, and print service
to users. Based on your Internet experience what kind of
services users can get from the Internet?
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Brief history of the Internet
1969 The Defense Advanced Research Projects
developed ARPANET, the precursor of the Internet
1971 Ray Tomlison invents e-mail
1979 USENET newsgroups created at Duke University
and the University of North Carolina
1984 Domain Name System (DNS) established
1991 Tim Berners-Lee creates the World Wide Web
1994 First online shopping mall, first spam email, first
pizza ordered online, first advertisement banner
2000 A major denial of service attack brings down
websites such as Yahoo!, Amazon.com, and eBay
2002 Denial of service attack knocks out 8/15 root DNS
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servers
Test your Internet knowledge (2)
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Based on your Internet experience what are the
different types Internet connections a residential
user or a business can subscribe for?
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Accessing the Internet
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Accessing the Internet (www)
Web
Browser
Network
Packet
Webserver
Software
Packet
Route
User PC needs:
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Router
Workstation Operating System
TCP/IP
Web browser (e.g. Internet Explorer)
Internet access (e.g. thru an ISP)
IP Address (e.g. 128.150.50.9)
Webserver needs:
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Network Operating System
TCP/IP
Domain name (e.g. eiu.edu)
Internet access
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IP Address (e.g. 139.67.8.3)
IP Address
A number that uniquely identify a
computer connected to the Internet
 Four decimal numbers separated by dots
 Example: 128.171.17.13
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127.18.47.145
127.47.17.47
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Domain name
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Like a nickname given to a server
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Two or more text “labels” separated by
dots
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Easier to remember compared to IP
address
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microsoft.com
eiu.edu
sales.microsoft.com
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Domain Name System (DNS)
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System for searching IP addresses
based on domain names
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Domain Name System (DNS)
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Internet applications/services
 E-Mail
 File
transfers
 Instant messaging (IM)
 Newsgroups
 Streaming audio and video
 Internet telephony
 World Wide Web (WWW)
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E-Mail
Most popular and widely used Internet
application
 30 billion e-mails sent every day
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Spam – junk e-mail messages
Spam costs corporate America $9 billion per
year
Every e-mail message contains head that
describes source and destination for the
message
 E-mail messages are text, but may have
attachments of many types of digital data
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Viruses often transmitted via e-mail
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File Transfers
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File transfer protocol (FTP)
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Protocol providing for transmission of a file
between an Internet server and a user’s
computer
Peer-to-peer (P2P) file sharing
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Share data from one computer to another
Every user can be a server and a client
With P2P, every user on the network can make
data available to every other user on the
network
Examples of P2P File transfer systems:
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Napster
Kazaa
Gnutella
Limewire
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Instant Messaging
Allows user to create a private chat session
with another user
 IM started with AOL
 Many Web-based companies use IM
technology for customer service
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State of Virginia
eBay
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Usenet Newsgroups
Online, bulletin board discussion forums
 Users post and read messages
 More than 100,000 newsgroups
 Millions of newsgroup readers
 Important information resource, especially
for technical issues and products
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Streaming Audio and Video
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Creating and sending audio and video files
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Sports
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News
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Warriors of the Net
General
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ZDNet
Education
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Fox News
CNN radio
Business
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Men’s intercollegiate basketball at sports.yahoo.com
Major league baseball
Youtube.com
Also known as Podcasting
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Internet Telephony
Uses Voice-over Internet Protocol (VoIP)
 Can use your computer to make phone calls
 Software connects computers via the
Internet and transmits voice data
 Savings comes from eliminating toll charges
between locations
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Intranets and Extranets
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Intranet
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Internal company network that uses Internet
and WWW technologies.
Typical Use:
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Only authorized users can get access
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Finding and sharing work documents
Collaboration between employees to work in teams
Communication tool
Secured by firewall
Extranet
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Web site that allows customers and business
partners limited access to organizational intranet
Uses Internet and WWW technologies
Add additional security through the use of a 19
Virtual Private Network (VPN)
Summary Questions
Malaga
1) (a) Name some Internet applications/services (b)
What is Instant Messaging? (c) What is a newsgroup?
2) (a) What does a user PC needs for accessing the
World Wide Web? (b) What is needed on the
webserver side?
3) Name some Internet connection options available for
residential users and businesses.
Notes
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15, 16
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5-6
4) (a) What is a domain name? (b) What is Domain
Name System or DNS?
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5) (a) What is an intranet? (b) What is an extranet?
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